“…Infections after proximal humerus fractures are less common [4,29,32,40,46]. P. acnes is being recognized as a causal agent in shoulder infections with increasing frequency [3,7,14,18,33,35,37,39,45]. This nonspore-forming microaerophilic bacillus has a low level of virulence but has been established as a pathogen in endocarditis [30,42], meningitis [5,43], arthritis [23], osteomyelitis [1,31] and spondylitis [10,13].…”